• Tilted Angles in Sass - SitePoint
• Inverse trigonometric functions with Sass – TheSassWay.com

function getTiltedHeight(angle) {
  const a = 100;
  const A = 90 - angle;
  
  const c = a / Math.sin(Math.PI * A / 180);
  const b = Math.sqrt(Math.pow(c, 2) - Math.pow(a, 2));
  
  return `${Math.abs(b)}%`;
}